165000000 has 224 divisors, whose sum is σ = 595310976. Its totient is φ = 40000000.

The previous prime is 164999993. The next prime is 165000013. The reversal of 165000000 is 561.

It is a hoax number, since the sum of its digits (12) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 165000000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14999995 + ... + 15000005.

Almost surely, 2^165000000 is an apocalyptic number.

165000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297655488).

165000000 is an abundant number, since it is smaller than the sum of its proper divisors (430310976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165000000 is an frugal number, since it uses more digits than its factorization.

165000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 165000000 is about 12845.2325786651. The cubic root of 165000000 is about 548.4806552433.

Adding to 165000000 its reverse (561), we get a palindrome (165000561).

The spelling of 165000000 in words is "one hundred sixty-five million", and thus it is an aban number.